# Language

Jul 23 [Ari Moline, Ph.D.](https://blog.duolingo.com/author/emily/)

[**What’s the International Phonetic Alphabet, and how do I use it?**](https://blog.duolingo.com/how-is-the-international-phonetic-alphabet-used/)

Jul 21 [Anthony Chan, M.A.](https://blog.duolingo.com/author/anthony/)

[**Dear Duolingo: Why does Japanese have three writing systems?**](https://blog.duolingo.com/japanese-writing-systems/)

Jul 9 [Olivia Thayer, M.A.](https://blog.duolingo.com/author/olivia/)

[**When to use “tú” and “usted” in Spanish**](https://blog.duolingo.com/tu-vs-usted/)

Jul 8 [Lindsey Lange-Abramowitz, M.A.](https://blog.duolingo.com/author/lindsey/)

[**How to use infinitives in English (and over 130 examples!)**](https://blog.duolingo.com/infinitive-bare-form-english/)

Jul 8 [Lindsey Lange-Abramowitz, M.A.](https://blog.duolingo.com/author/lindsey/)

[**How to conjugate English verbs in the simple present**](https://blog.duolingo.com/simple-present/)

Jul 8 [Lindsey Lange-Abramowitz, M.A.](https://blog.duolingo.com/author/lindsey/)

[**100+ regular and irregular verbs in English**](https://blog.duolingo.com/list-of-verbs/)

Jul 8 [Lindsey Lange-Abramowitz, M.A.](https://blog.duolingo.com/author/lindsey/)

[**2 ways to form the future tense in English**](https://blog.duolingo.com/future-will-going-to/)

Jul 8 [Lindsey Lange-Abramowitz, M.A.](https://blog.duolingo.com/author/lindsey/)

[**How to use the present progressive in English**](https://blog.duolingo.com/progressive-verbs/)

Jul 8 [Cindy Blanco, Ph.D.](https://blog.duolingo.com/author/cindy/)

[**Types of English verbs: modals, auxiliaries, and more**](https://blog.duolingo.com/types-of-verbs/)